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Elastic collision between bowling ball and tennis ball

  1. Oct 18, 2012 #1
    1. The problem statement, all variables and given/known data

    9.6 A table-tennis ball is thrown at a stationary bowling ball. The
    table-tennis ball makes a one-dimensional elastic collision and bounces back
    along the same line. Compared with the bowling ball after the collision, does
    the table-tennis ball have (a) a larger magnitude of momentum and more
    kinetic energy, (b) a smaller magnitude of momentum and more kinetic
    energy, (c) a larger magnitude of momentum and less kinetic energy, (d) a
    smaller magnitude of momentum and less kinetic energy, or (e) the same
    magnitude of momentum and the same kinetic energy?

    2. Relevant equations

    p = mv
    k = 1/2 m v^2

    3. The attempt at a solution

    please help me understand this
     
  2. jcsd
  3. Oct 19, 2012 #2
    You have a light moving object (tennis ball) impact and reflect from a heavy stationary object (bowling ball). Think in terms of conservation of momentum and energy. Remember, momentum is a vector so it has a magnitude and direction.
    Let's say the ball was moving in the positive direction, then after the impact, its moving in the negative direction. What has to happen to conserve momentum?
     
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